CN114278391B - Stator blade group for turbine with tight fit installation - Google Patents
Stator blade group for turbine with tight fit installation Download PDFInfo
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- CN114278391B CN114278391B CN202111640923.XA CN202111640923A CN114278391B CN 114278391 B CN114278391 B CN 114278391B CN 202111640923 A CN202111640923 A CN 202111640923A CN 114278391 B CN114278391 B CN 114278391B
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- 238000009434 installation Methods 0.000 title claims description 14
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 101100454739 Arabidopsis thaliana LUG gene Proteins 0.000 description 2
- 101100256915 Arabidopsis thaliana SIC gene Proteins 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 101100305998 Toxoplasma gondii (strain ATCC 50611 / Me49) RON2 gene Proteins 0.000 description 2
- 101100305999 Toxoplasma gondii RON4 gene Proteins 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention relates to a stator blade set for a tightly-matched turbine, which is arranged in the turbine, an adjustable integrated holding ring is arranged in the turbine, an inner cavity which is radially enlarged from one end to the other end is arranged in the adjustable integrated holding ring, the stator blade set for the tightly-matched turbine comprises a plurality of stages of stator blade units which are axially inserted into the inner cavity, each stage of stator blade unit is provided with a plurality of stator blades, each stator blade comprises a blade profile, a shroud and a blade root which are respectively formed at two ends of the blade profile, a shroud back surface is formed on the shroud, a blade root back surface is formed on the blade root, the shroud back surface and the blade root back surface are arranged on a non-same plane, when each stator blade set of each stage of stator blade unit is aligned, the contact gap between the adjacent blade root back surfaces is zero, and the adjacent shroud back surfaces are in interference fit. According to the stator blade group for the turbine, which is closely matched, the stator blade units are assembled in a whole circle to form the whole circle rigid part, so that the dynamic stiffness of the stator blades is enhanced, and the vibration performance is further improved.
Description
Technical Field
The invention relates to the technical field of turbines, in particular to a stator blade set for a turbine, which is tightly assembled.
Background
With the proposals of large pressure, low coal consumption, peak carbon reaching and carbon neutralization targets in China, the traditional small and medium-sized coal consumption type high energy consumption steam turbines are gradually eliminated and are out of the market, and accordingly, high-efficiency steam turbines are becoming more and more attractive, and in power station steam turbines for industrial power generation, the high efficiency depends on the through-flow design of the steam turbines, namely, the blade type design of the steam turbines, the flow area design among blades and the like.
Disclosure of Invention
In order to solve the problems, the invention provides a stator blade group for a turbine, which is provided with tight fit, and the tight fit is arranged, so that the stator blade units form a whole circle of rigid piece in a whole circle of paired stator blade units, thereby enhancing the dynamic stiffness of the stator blades and further improving the vibration performance.
The technical scheme adopted by the invention is as follows: the utility model provides a install close-fitting turbine is with stator blade group installs in the steam turbine, install adjustable integrated in the steam turbine in the ring is held, adjustable integrated is held and is equipped with the radial gradually enlarged inner chamber from one end to the other end in the ring, install close-fitting turbine is with stator blade group including axial cartridge in multistage stator blade unit in the inner chamber, each level stator blade unit all has arranged a plurality of stator blades, each stator blade all include the blade profile and respectively the shaping in shroud and the blade root at blade profile both ends, form the shroud back on the shroud, be formed with the blade root back on the blade root, the shroud back with the non-coplanar setting between the blade root back, each stator blade unit at each stage each stator blade is whole circle to the time, adjacent the contact gap at blade root back is zero, adjacent the interference fit between the shroud back.
As a further limitation to the above technical solution, a blade root groove is formed in the bottom of the blade root, an insertion groove for inserting the bottom of the blade root is formed in the adjustable integrated holding ring, and an installation gap is formed between the blade root groove and the groove bottom of the insertion groove.
As a further limitation to the above technical solution, a gasket is filled in the installation gap in an interference manner, and the gasket is a nickel-containing stainless steel gasket.
As a further limitation to the above technical scheme, the blade profile is formed by sequentially and smoothly transiting a RON 1-RON 2 curve segment, a RON 2-RON 3 curve segment, a RON 3-RON 4 curve segment, a RON 4-RON 5 curve segment, a RON 5-RON 6 curve segment and a RON 6-RON 1 curve segment, the upper top end of the RON 6-RON 1 curve segment is provided with a steam outlet edge of the blade profile, the lower top end of the RON 3-RON 4 curve segment is provided with a steam inlet edge of the blade profile, and a suction surface of the blade profile and a pressure surface of the blade profile are respectively enclosed between two sides of the steam inlet edge and the steam outlet edge.
As a further limitation to the above technical solution, the steam inlet edge is fattened, the steam outlet edge is thin, so that the steam of the steam turbine is tapered from the steam inlet edge to the steam outlet edge, the thickness of the front edge of each blade profile is 0.8 mm-1 mm, and the thickness of the tail edge of each blade profile is 0.15-0.19 mm.
As a further limitation to the above technical solution, a stationary blade height is formed in the height direction of each blade profile, the stationary blade height of each stage of the stationary blade unit is 21.6mm to 33.8mm, moving blades adapted to each stationary blade are provided on the steam turbine, each moving blade is formed with a moving blade height, and each stationary blade height is 2mm lower than the moving blade height of the adapted position.
As a further limitation to the technical scheme, the stator blade units are of fourteen stages, one end of the inner cavity with smaller diameter is a high-pressure steam inlet end, a first stage stator blade unit in the fourteen stages stator blade units is arranged close to the high-pressure steam inlet end, and the number of stator blades arranged in each stage stator blade unit is 104-126.
As a further limitation to the above technical solution, the vane width of each of the stator vanes is 11.2 mm-14.96 mm, the chord length is 16mm or 20mm, the stator vane mounting angle is 45 0～490, and when the vane root is inserted into the adjustable integrated retaining ring, the shroud is pretwisted around the stator vane mounting angle relative to the vane root.
As a further limitation to the above technical solution, a pitch diameter is formed on each of the stationary blades, each pitch diameter is located at a middle position of each stationary blade height, a throat width and a blade pitch are provided between adjacent stationary blades on the steam outlet side on a cross section of each pitch diameter, the throat width is 3.83mm to 5.31mm, and the blade pitch is 13.97mm to 17.33mm.
Further limiting the technical scheme, the relative pitch of each static blade is 0.85 mm-0.9 mm.
According to the stator blade set for the tight-fit turbine, the adjustable integrated holding ring is arranged in the turbine, the inner cavity which is gradually enlarged from one end to the other end in the radial direction is formed in the adjustable integrated holding ring, the stator blade set for the tight-fit turbine comprises the multistage stator blade units which are axially inserted into the inner cavity, the multistage stator blade units can be densely distributed in the adjustable integrated holding ring, and the tight-fit installation of the stator blade set is realized in place of the independent arrangement mode of the stator blade units at all stages; the stator blade units are arranged on the back of the shroud band in a non-same plane, the stator blade units are arranged on the back of the blade root in a whole circle, the contact gap between the back of the blade root and the back of the blade root is zero, and the adjacent stator blade units are in interference fit with each other.
Drawings
FIG. 1 is a schematic view of an assembled structure of a stator vane pack for a turbine equipped with a close fit according to the present invention;
FIG. 2 is a schematic view of an assembled configuration of a single stage vane unit according to the present invention;
FIG. 3 is a schematic view of the A-A pitch circle deployment configuration of FIG. 2;
FIG. 4 is a schematic view of a vane configuration;
FIG. 5 is a side view of FIG. 4;
FIG. 6 is an enlarged view of the structure at B of FIG. 5;
FIG. 7 is an isometric view of FIG. 4;
FIG. 8 is a right side view of FIG. 4;
FIG. 9 is a C-C view of FIG. 8;
Fig. 10 is a schematic view of a profile structure of a blade profile.
In the figure:
1-stator blade unit, 11-stator blade, 111-blade profile, 1111-steam outlet edge, 1112-steam inlet edge, 1113-suction surface, 1114-pressure surface, 1115-steam inlet arc, 112-shroud, 1121-shroud back, 1122-shroud angle, 1123-high tip, 1124-low tip, 113-blade root, 1131-blade root back, 1132-blade root slot, 1133-blade root angle, 1134-rectangular slot, H1-stator blade height, W1-blade width, C1-chord length, GM 1-stator blade mounting angle, ΦD-pitch diameter, O-throat width, T n -blade pitch, T - -relative pitch, LT 1-leading edge thickness, TT 1-trailing edge thickness, 2-adjustable integrated shroud, 21-inner cavity.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
Examples
In the embodiment, in order to meet the optimization of the expansion work of steam, the three-dimensional flow field design technology is adopted to optimize, the taper of the inner cavity 21 is designed to be 1:6, the stator blade set for the turbine which is closely matched comprises a plurality of stages of stator blade units 1 which are axially inserted into the inner cavity 21, each stage of stator blade units 1 is provided with a plurality of stator blades 11, each stator blade 11 comprises a blade profile 111, a shroud 112 and a blade root 113 which are respectively formed at two ends of the blade profile 111, and a shroud back 1121 is formed on the shroud 112, as shown in fig. 4 and 5, the blade root 113 is formed with a blade root back 1131, a shroud back 1121 and a blade root back 1131 are arranged in a non-coplanar manner, the contact gap between each stator blade 11 of each stator blade unit 1 is zero, the adjacent shroud back 1121 is in interference fit, the shroud back 1121 and the blade root back 1131 are arranged in a non-coplanar manner, the contact gap between each stator blade 11 of each stator blade unit 1 is zero, the adjacent shroud back 1121 is in interference fit, when each stator blade 11 is installed, the shroud 112 of each stator blade 11 generates pretwist around the installation angle of the stator blade 11 relative to the blade root 113 of the stator blade 11, the tight fit installation of the stator blades 11 in the circumferential direction is realized, the whole circle of the shroud back 1121 is formed into a whole circle of rigid piece, the dynamic stiffness of the stator blade is enhanced, further improving the vibration performance.
In this embodiment, the shroud back surface 1121 is higher than the blade root back surface 1131, specifically, the height of the shroud back surface 1121 higher than the blade root back surface 1131 is 0.06698mm, so that the contact gap between the blade root back surfaces 1131 of the stator blades 11 is zero when each stage of stator blades 11 are assembled in a whole circle, the interference of the contact surfaces between the shroud back surfaces 1121 is 0.06698mm, and the shroud 112 generates a pretwisting action around the installation angle of the stator blades 11 relative to the blade root 113 during the installation process of the stator blades 11, thereby enhancing the assembly strength; meanwhile, the mounting action of super close fitting is realized between the stator blades 11 in the circumferential direction after the whole circle of assembly, so that the stable and reliable whole circle of stator blades 11 without gaps are formed, and the dynamic stiffness, vibration resistance and safety of the stator blades 11 under the action of dynamic and static stress are enhanced, so that the continuous flushing of high-temperature and high-pressure steam is satisfied; and because the interference of the contact surface between the back 1121 of the shroud is 0.06698mm, the shroud 112 is in interference fit, so that the self-vibration frequency of the stator vanes 11 is changed, the vibration amplitude of the stator vanes 11 along with steam scouring is reduced, the vibration safety of the stator vanes 11 is improved, the leakage loss can be relatively reduced, and the steam utilization rate is improved.
In this embodiment, as shown in fig. 7 and 9, a shroud angle 1122 with a diamond-shaped cross section is formed on the shroud 112, a root angle 1133 with a diamond-shaped cross section is formed on the blade root 113, and the vane mounting angle GM1 is the angle between the chord line and the frontal line of the vane profile 111.
In order to facilitate the installation of the stator blade 11, a blade root groove 1132 is formed in the bottom of the blade root 113, in this embodiment, a plug-in groove for the bottom plug-in of the blade root 113 is formed in the adjustable integrated holding ring 2, an installation gap is formed between the blade root groove 1132 and the bottom of the plug-in groove for facilitating the assembly, in order to ensure that the stator blade 11 installed on the adjustable integrated holding ring 2 is tightly installed in the radial direction, a gasket is filled in the installation gap in an interference manner, the dynamic stress borne by the blade root 113 is reduced, specifically, the thickness of the gasket is different, and the specifications of 0.1mm, 0.2mm, 0.25mm and 0.5mm are respectively selected.
In order to facilitate the insertion of the adjustable integrated holding ring 2, as shown in fig. 4, rectangular slots 1134 are symmetrically formed on two sides of the blade root 113 along the central line thereof, inner hole T-shaped slots are formed on the holding ring body, and the rectangular slots 1134 and the inner hole T-shaped slots can be inserted through the arrangement of the rectangular slots 1134 symmetrically formed on two sides of the holding ring body along the central line of the blade root 113, so that the assembly is convenient, and the assembly quality is ensured.
In this embodiment, for easy assembly, as shown in fig. 4, in the height direction of each rectangular slot 1134, the opening surface of each rectangular slot 1134 is provided with an arc surface, that is, along the height direction of the stator blade 11, on the blade root 113 above and below the rectangular slot 1134 is provided with arc surfaces respectively.
As shown in fig. 10, the vane 111 is formed by smoothly transitioning RON1 to RON2, RON2 to RON3, RON3 to RON4, RON4 to RON5, RON5 to RON6, and RON6 to RON1 in order, and by providing the vane 111 as the six-segment curve, the vane 111 with discrete points is improved, thereby improving the working efficiency, simplifying the processing technique of the stator vane 11, and reducing the processing cost of the stator vane 11.
In this embodiment, as shown in fig. 10, the upper top end of the RON 6-RON 1 curve segment is provided with a steam outlet edge 1111 of the airfoil 111, the lower top end of the RON 3-RON 4 curve segment is provided with a steam inlet edge 1112 of the airfoil 111, and suction surfaces 1113 of the airfoil 111 and pressure surfaces 1114 of the airfoil 111 are respectively enclosed between two sides of the steam inlet edge 1112 and the steam outlet edge 1111, so as to realize high efficiency of the steam turbine.
In order to meet the requirement that the steam expands after acceleration and generates pressure drop, and further, the conversion of heat energy into kinetic energy is realized, in this embodiment, the steam inlet edge 1112 is fattened, the steam outlet edge 1111 is thin, and the steam of the steam turbine is gradually reduced from the steam inlet edge 1112 to the steam outlet edge 1111 as shown in fig. 3. In this embodiment, as shown in fig. 9, the airfoil 111 has a leading edge thickness LT1 and a trailing edge thickness TT1, where the leading edge thickness LT1 refers to the leading edge diameter, that is, the circular diameter dimension of the curve segment formed by the inner arc (pressure surface 1114) data point and the curve segment formed by the back arc (suction surface 1113) data point at the steam inlet end position (leading edge position) in the cross section forming the channel of the airfoil 111; the tail edge thickness TT1 refers to the tail edge diameter, that is, the circular diameter dimension of the tangent of the curve segment formed by the inner arc (pressure surface 1114) data points and the curve segment formed by the back arc (suction surface 1113) data points at the steam outlet end position (tail edge position) on the cross section forming the channel of the blade profile 111, specifically, the front edge thickness LT1 of each blade profile 111 is selectable from 0.8mm to 1mm, and the tail edge thickness TT1 of each blade profile 111 is selectable from 0.15 mm to 0.19 mm.
As shown in fig. 4, a vane height H1 is formed in the height direction of each vane pattern 111, the vane height H1 of each vane unit 1 is 21.6mm to 33.8mm, moving blades which are adapted to each vane 11 are provided on the turbine, each moving blade is formed with a moving blade height, and each vane height H1 is 2mm lower than the moving blade height of the adapted position, so that the air flow is facilitated to fill the entire vane flow path.
In this embodiment, as shown in fig. 1, the stator blade units 1 are fourteen stages, the end of the inner cavity 21 with the smaller diameter is a high-pressure steam inlet end, the first stage stator blade unit in the fourteen stages stator blade units 1 is arranged close to the high-pressure steam inlet end, and the number of stator blades 11 arranged in each stage stator blade unit is 104-126.
Specifically, as shown in fig. 3, 8 and 9, the vane width W1 of each stator vane 11 is 11.2mm to 14.96mm, the chord length C1 is 16mm or 20mm, the stator vane mounting angle GM1 is 45 0～490, and when the blade root 113 is inserted into the adjustable integrated retainer ring 2, the shroud 112 is pretwisted around the stator vane mounting angle GM1 with respect to the blade root 113. The stator vanes 11 are respectively formed with a pitch diameter Φd, the pitch diameter Φd is positioned at the middle position of the height H1 of each stator vane, the throat width O and the vane pitch Tn are arranged between the adjacent stator vanes 11 on the steam outlet side on the section of the pitch diameter Φd, the throat width O is 3.83 mm-5.31 mm, the vane pitch Tn is 13.97 mm-17.33 mm, and the relative pitch t - of each stator vane 11 is 0.85 mm-0.9 mm.
The connecting lines of the stator blades 11 of each stage connected by the pitch diameter phid are scattered in a horn taper, and in the embodiment, the taper angle is preferably 6 degrees, so as to satisfy expansion work of steam between the through flows of the stator blades 11 and generate pressure drop.
The blade width W1 is the vertical distance between the steam inlet edge 1112 and the steam outlet edge 1111 of the blade profile 111, the chord length C1 is the projection length of the blade profile 111 on the chord line, the throat width O is the minimum width of the channel between two adjacent stator blades 11 in the blade cascade, the blade pitch Tn is the distance between corresponding points on two adjacent stator blades 11 in the blade cascade, the relative pitch t - is the ratio of the blade pitch Tn to the chord length C1, in this embodiment, the blade width W1 and the chord length C1 determine the size of the blade profile 111, the throat width O and the blade pitch Tn are used for checking the fit gap after the stator blades 11 are installed, and the relative pitch t - is used for avoiding the waste of blade material processing while controlling the strength of the blade itself.
In this embodiment, the most preferable stator blade height H1, blade width W1, chord length C1, throat width O, blade pitch Tn, relative pitch t -, stator blade mounting angle GM1, leading edge thickness LT1, trailing edge thickness TT1, and the number of stator blades 11 in each stage of stator blade units are shown in the following table:
As shown in fig. 5 and fig. 6, in order to facilitate the steam flow from the moving blades of the steam turbine to the stator blades 11, the trend of the flow diffusing to the two ends of the shroud 112 and the blade root 113 is reduced, and the air leakage of the flow at the two ends of the shroud 112 and the blade root 113 is further reduced, in this embodiment, an air inlet arc 1115 is disposed on the air inlet edge 1112 of the blade profile 111 in the height direction.
On the premise of limited efficiency drop of the stator blade 11, in order to simplify the processing technology of the stator blade 11, in this embodiment, the profile of the blade profile 111 is a straight blade profile with a uniform cross section, that is, the profile and the area of the blade profile 111 are the same along the height H1 of the stator blade, so that the processing is convenient, the manufacturing cost is low, and the universality of the blade profile 111 is facilitated.
As shown in FIG. 4, the shroud 112 is provided with a high-blade top 1123 and a low-blade top 1124 adjacent to each other so as to form a through-flow radial gap with the rotor steam-blocking sheet of the steam turbine, by providing the high-blade top 1123 and the low-blade top 1124 adjacent to each other, a better through-flow radial gap is formed with the steam-blocking sheet mounted at the same position on the rotor of the steam turbine, and by comparing through-flow software simulation and actual use effects, the shroud 112 is provided with a steam seal effect of the high-blade top 1123 and the low-blade top 1124 adjacent to each other, which is better than that of the flat-blade top in the prior art, in this embodiment, the through-flow radial gap is 0.5mm.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should substitute or change the technical solution according to the technical concept of the present invention, to cover the scope of the present invention.
Claims (9)
1. The utility model provides a install close-fitting turbine and use stator blade group, installs in the steam turbine, its characterized in that: an adjustable integrated holding ring is arranged in the steam turbine, an inner cavity which is radially enlarged from one end to the other end is arranged in the adjustable integrated holding ring, the stator blade group for the steam turbine, which is closely matched with the inner cavity, comprises a plurality of stages of stator blade units which are axially inserted into the inner cavity, each stage of stator blade unit is provided with a plurality of stator blades, each stator blade unit comprises a blade profile, and a shroud and a blade root which are respectively formed at two ends of the blade profile, a shroud back surface is formed on the shroud, a blade root back surface is formed on the blade root, the shroud back surface and the blade root back surface are arranged on a non-same plane, when each stator blade unit of each stage of stator blade unit is assembled in whole circle, the contact gap between the adjacent blade root back surfaces is zero, and the adjacent shroud back surfaces are in interference fit;
The blade width of each stator blade is 11.2-14.96 mm, the chord length is 16mm or 20mm, the stator blade installation angle is 45 0～490, and when the blade root is inserted into the adjustable integrated holding ring, the shroud ring generates pretwist around the stator blade installation angle relative to the blade root;
adjacent high-blade tops and low-blade tops are arranged on the shroud so as to form a through-flow radial gap with a rotor steam-blocking sheet of the steam turbine.
2. The turbine vane pack of claim 1, wherein: a blade root groove is formed in the bottom of the blade root, an inserting groove for inserting the bottom of the blade root is formed in the adjustable integrated holding ring, and an installation gap is formed between the blade root groove and the groove bottom of the inserting groove.
3. The turbine vane pack of claim 2, wherein: and gaskets are filled in the mounting gaps in an interference manner, and the gaskets are nickel-containing stainless steel gaskets.
4. The turbine vane pack of claim 2, wherein: the blade profile is formed by sequentially and smoothly transiting a RON 1-RON 2 curve section, a RON 2-RON 3 curve section, a RON 3-RON 4 curve section, a RON 4-RON 5 curve section, a RON 5-RON 6 curve section and a RON 6-RON 1 curve section, the upper top end of the RON 6-RON 1 curve section is provided with a steam outlet edge of the blade profile, the lower top end of the RON 3-RON 4 curve section is provided with a steam inlet edge of the blade profile, and a suction surface of the blade profile and a pressure surface of the blade profile are respectively enclosed between the steam inlet edge and two sides of the steam outlet edge.
5. The turbine vane pack of claim 4, further comprising: the steam inlet edge is thick, the steam outlet edge is thin, so that steam of the steam turbine is gradually reduced from the steam inlet edge to the steam outlet edge, the front edge thickness of each blade profile is 0.8-1 mm, and the tail edge thickness of each blade profile is 0.15-0.19 mm.
6. The turbine vane pack of claim 4, further comprising: the stator blade units of each stage are provided with rotor blades matched with the stator blades, the rotor blades are respectively provided with a rotor blade height, and the rotor blade heights are respectively lower than the rotor blade height of the matched position by 2mm.
7. The turbine vane pack of claim 6, further comprising: the stator blade units are of fourteen stages, one end of the inner cavity with smaller diameter is a high-pressure steam inlet end, a first stage stator blade unit in the fourteen stages is arranged close to the high-pressure steam inlet end, and the number of stator blades arranged in each stage of stator blade units is 104-126.
8. The turbine vane pack of claim 7, wherein: the stator blades are respectively formed with pitch diameters, the pitch diameters are positioned at the middle position of the height of each stator blade, on the section of each pitch diameter, throat width and blade pitch are arranged between adjacent stator blades on the steam outlet side, the throat width is 3.83-5.31 mm, and the blade pitch is 13.97-17.33 mm.
9. The turbine vane pack of claim 8, wherein: the relative pitch of each stator blade is 0.85 mm-0.9 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111640923.XA CN114278391B (en) | 2021-12-29 | 2021-12-29 | Stator blade group for turbine with tight fit installation |
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| CN202111640923.XA CN114278391B (en) | 2021-12-29 | 2021-12-29 | Stator blade group for turbine with tight fit installation |
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| CN114278391B true CN114278391B (en) | 2024-04-19 |
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